Climate Change as a National Security Threat: Conflict, Migration, and Resource Scarcity

Climate change is increasingly recognized by military establishments worldwide as a threat multiplier that exacerbates existing security challenges and creates new ones. Rising temperatures, sea level rise, extreme weather events, and resource scarcity interact with existing social, economic, and political vulnerabilities to create conditions conducive to instability and conflict.

Water scarcity is perhaps the most immediate climate-related security threat. The Nile basin, shared by Egypt, Sudan, and Ethiopia, is a flashpoint where the Grand Ethiopian Renaissance Dam has generated tensions that have included military threats. The Tigris-Euphrates system, vital to Turkey, Syria, and Iraq, is under severe stress from reduced precipitation and upstream damming. The Indus basin, shared by India and Pakistan, two nuclear-armed rivals, faces glacial melt that will eventually reduce water availability for hundreds of millions.

Military operations themselves are affected by climate change. Naval bases face flooding from sea level rise, with facilities in Norfolk, Diego Garcia, and Guam all vulnerable. Arctic military operations become more complex as permafrost thaws degrade airfield and infrastructure foundations. Extreme heat events reduce the operational effectiveness of troops and equipment. The US Department of Defense has identified over 1,700 military installations worldwide as vulnerable to climate-related risks.

Climate-driven migration represents another security dimension. Hundreds of millions of people in low-lying coastal areas, arid regions, and areas dependent on glacial meltwater face potential displacement. The security implications of mass migration have been demonstrated in the European refugee crisis and the Central American migration patterns, both of which had destabilizing political effects far beyond the immediately affected regions.